Instead of

@nowarn("id=E219")

I would like to write

@nowarn("id=E" + DefaultShadowsGivenID)

or actually

@nowarn(s"id=E${DefaultShadowsGivenID.compileTimeOrdinal}")

or better

@nowarn(s"id=${DefaultShadowsGivenID.errorID}")

This may require an annotation for the enum, that it is monotonic and scalac will refuse to compile incrementally if that condition is not met.

@monotonic 
enum Foo